This study explores the potential of Michelia champaca wood as a sustainable and locally available precursor for the fabrication of high-performance supercapacitor electrodes.Activated carbons were synthesized through...This study explores the potential of Michelia champaca wood as a sustainable and locally available precursor for the fabrication of high-performance supercapacitor electrodes.Activated carbons were synthesized through single-step carbonization at 400℃ and 500℃(SSC-400℃ and SSC-500℃) and double-step carbonization at 400℃(DSC-400℃),with all samples activated using H_(3)PO_(4).The effects of carbonization stratergy on the structural,morphological,and electrochemical characteristics of the resulting carbon materials were systematically evaluated,using techniques such as BET,SEM,TEM,XRD,Raman scattering,FTIR,CV,GCD and EIS.Among the samples,SSC-400℃ exhibited the best electrochemical performance,achieving a specific capacitance of 292.2 Fg^(-1),an energy density of 6.4 Wh kg^(-1),and a power density of 198.4 W kg^(-1).This superior performance is attributed to its optimized pore structure,improved sur-face functionality and enhanced conductivity.SSC-500℃showed marginally lower performance,whereas,DSC-400℃ displayed the least favorable results,indicating that double-step carbonization process may negatively affect material quality by disrupting the pore network.This work highlights a strong correlation between synthesis methodology and electrochemical efficiency,directly reinforcing the importance of process optimization in electrode material develop-ment.The findings contribute to the broader goal of developing cost-effective,renewable and environmentally friendly energy storage systems.By valorizing biomass waste,the study supports global movements toward green energy technologies and circular carbon economies,offering a viable pathway for sustainable supercapacitor development and practical applications in energy storage devices.展开更多
Graphene oxide has been used widely as a starting precursor for applications that cater to the needs of tunable graphene. However, the hydrophilic characteristic limits their application, especially in a hydrophobic c...Graphene oxide has been used widely as a starting precursor for applications that cater to the needs of tunable graphene. However, the hydrophilic characteristic limits their application, especially in a hydrophobic condition. Herein, a novel non-covalent surface modification approach towards graphene oxide was conducted via a UV-induced photo-polymerization technique that involves two major routes; a UV-sensitive initiator embedded via pi-pi interactions on the graphene planar rings, and the polymerization of hydrophobic polymeric chains along the surface. The functionalized graphene oxide successfully achieved the desired hydrophobicity as it displayed the characteristic of being readily dissolved in organic solvent. Upon its addition into a polymeric solution and subjected to an electrospinning process,non-woven random nanofibers embedded with graphene oxide sheets were obtained. The prepared polymeric nanofibers were subjected to two-step thermal treatments that eventually converted the polymeric chains into a carbon-rich conductive structure. A unique morphology was observed upon the addition of the functionalized graphene oxide, whereby the sheets were embedded and intercalated within the carbon nanofibers and formed a continuous structure. This reinforcement effectively enhanced the electrochemical performance of the carbon nanofibers by recording a specific capacitance of up to 140.10 F/g at the current density of 1 A/g, which was approximately three folds more than that of pristine nanofibers.It also retained the capacitance up to 96.2% after 1000 vigorous charge/discharge cycles. This functionalization technique opens up a new pathway in tuning the solubility nature of graphene oxide towards the synthesis of a graphene oxide-reinforced polymeric structure.展开更多
A novel zinc tartrate oriented hydrothermal synthesis of microporous carbons was reported. Zinc–organic complex obtained via a simple chelation reaction of zinc ions and tartaric acid is introduced into the networks ...A novel zinc tartrate oriented hydrothermal synthesis of microporous carbons was reported. Zinc–organic complex obtained via a simple chelation reaction of zinc ions and tartaric acid is introduced into the networks of resorcinol/formaldehyde polymer under hydrothermal condition. After carbonization process, the resultant microporous carbons achieve high surface area（up to 1255 m^2/g） and large mean pore size（1.99 nm） which guarantee both high specific capacitance（225 F/g at 1.0 A/g） and fast charge/discharge operation（20 A/g） when used as a supercapacitor electrode. Besides, the carbon electrode shows good cycling stability, with 93% capacitance retention at 1.0 A/g after 1000 cycles. The welldesigned and high-performance microporous carbons provide important prospects for supercapacitor applications.展开更多
As a supercapacitor electrode, the graphene/polyaniline （PANI） composite sponge with a three-dimensional （3D） porous network structure is synthesized by a simple three-step method. The three steps include an in si...As a supercapacitor electrode, the graphene/polyaniline （PANI） composite sponge with a three-dimensional （3D） porous network structure is synthesized by a simple three-step method. The three steps include an in situ polymerization, freeze-drying and reduction by hydrazine vapor. The prepared sponge has a large specific surface area and porous network structure, so it is in favor of spreading the electrolyte ion and increasing the charge transfer efficiency of the system. The process of preparation is simple, easy to operate and low cost. The composite sponge shows better electrochemical performance than the pure individual graphene sponge while PANI cannot keep the shape of a sponge. Such a composite sponge exhibits specific capacitances of 487 F.g-1 at 2 mV/s compared to pristine PANI of 397 F.g-1.展开更多
We demonstrate a simple and highly efficient strategy to synthesize MnO2/nitrogen-doped ultramicroporous carbon nanospheres（MnO2/N-UCNs） for supercapacitor application.MnO2/N-UCNs were fabricated via a template-free...We demonstrate a simple and highly efficient strategy to synthesize MnO2/nitrogen-doped ultramicroporous carbon nanospheres（MnO2/N-UCNs） for supercapacitor application.MnO2/N-UCNs were fabricated via a template-free polymerization of resorcinol/formaldehyde on the surface of phloroglucinol/terephthalaldehyde colloids in the presence of hexamethylenetetramine,followed by carbonization and then a redox reaction between carbons and KMnO4.As-prepared MnO2/N-UCNs exhibits regular ultramicropores,high surface area,nitrogen heteroatom,and high content of MnO2.A typical MnO2/N-UCNs with 57 wt.%MnO2 doping content（denoted as MnO2（57%）/N-UCNs） makes the most use of the synergistic effect between carbons and metal oxides.MnO2（57%）/N-UCNs as a supercapacitor electrode exhibits excellent electrochemical performance such as a high specific capacitance（401 F/g at 1.0 A/g） and excellent charge/discharge stability（86.3%of the initial capacitance after 10,000 cycles at 2.0 A/g） in 1.0 mol/L Na2SO4 electrolyte.The well-designed and high-performance MnO2/N-UCNs highlight the great potential for advanced supercapacitor applications.展开更多
The deposition of active materials directly onto metal wires is a general strategy to prepare wire-shaped electrodes for flexible and wearable energy storage devices. However, it is still a critical challenge to coat ...The deposition of active materials directly onto metal wires is a general strategy to prepare wire-shaped electrodes for flexible and wearable energy storage devices. However, it is still a critical challenge to coat active materials onto the aimed metal wires because of their smooth surface and small specific surface area. In this work, high porous nickel yarns（PNYs） was fabricated using commercial nylon yarns as templates through step-wise electroless plating, electroplating and calcination processes. The PNYs are composed of multiplied fibers with hollow tubular structure of 5–10 μm in diameter, allowing the imbibition of carbon nanotubes（CNTs） solution by a facile capillary action process. The prepared CNTs/PNY electrodes showed a typical electrochemical double layer capacitive performance and the constructed allsolid flexible wire-shaped symmetric supercapacitors provided a specific capacitance of 4.67 F/cm3 with good cycling stability at a current density of 0.6 A/cm3.展开更多
Nickel nanowire foams are primarily synthesized by the calcination of dimethylglyoxime nickel microfibers in Ar gas.Moreover,mesoporous nickel hydroxide-nickel nanohybrids are successfully obtained via oxidation of Ni...Nickel nanowire foams are primarily synthesized by the calcination of dimethylglyoxime nickel microfibers in Ar gas.Moreover,mesoporous nickel hydroxide-nickel nanohybrids are successfully obtained via oxidation of Ni nanowire foams in an alkaline H_(2)O_(2)aqueous solution.Due to the mesoporous structure of nickel hydroxide and the high conductivity of the central Ni metal,electrodes assembled with nickel hydroxide-nickel nanohybrids show a highly accessible surface-interface site and high conductivity,and are successfully applied as high-performance supercapacitor electrodes.展开更多
In this work,mesoporous NiCo_(2)O_(4) nanoneedle arrays grown on a nickel foam substrate are fabricated by a facile hydrothermal route.The as-synthesized NiCo_(2)O_(4) products as binder-free electrodes for supercapac...In this work,mesoporous NiCo_(2)O_(4) nanoneedle arrays grown on a nickel foam substrate are fabricated by a facile hydrothermal route.The as-synthesized NiCo_(2)O_(4) products as binder-free electrodes for supercapacitors show a superior discharge areal capacity of 0.998 C cm^(-2) at a current density of 2 mA cm^(-2),excellent rate performance(60.25% retention with current density increasing from 2 mA cm^(-2) to 200 mA cm^(-2))and outstanding cycling stability(about 19.3% loss after 12000 cycles at a current density of 20 mA cm^(-2)).An assembled supercapacitor using a NiCo_(2)O_(4) electrode as the positive electrode delivers a volumetric energy density of 0.33 mW h cm^(-3) at a volumetric power density of 12 mW h cm^(-3) and still achieves 63.6% retention with the volumetric power density increasing to 120 mW h cm^(-3).Surprisingly,140.6% capacity retention is attained after 8000 cycles at 10 mA cm^(-2).展开更多
In this study,cobalt-doped nickel sulfide nanomaterials are synthesized.The experimental results show that cobalt is successfully doped into the lattice of NiS_(2).Co-doping causes the hollow sphere sulphides to break...In this study,cobalt-doped nickel sulfide nanomaterials are synthesized.The experimental results show that cobalt is successfully doped into the lattice of NiS_(2).Co-doping causes the hollow sphere sulphides to break down and favors the formation of Ni_(x)Co_(1-x)S_(2)nanostructures with high-density active edge sites.The Ni_(0.75)Co_(0.25)S_(2)sample exhibits a high specific capacitance of 2141.9 F g^(-1)at a current density of 2 A g^(-1)due to its fluffy characteristics and edge site-enriched nanostructure.The asymmetric supercapacitor based on Ni_(0.75)Co_(0.25)S_(2)exhibits a high energy density(54.9 Wh kg^(-1))and stable cycling durability with 85.1%capacitance retention after 4000 cycles.展开更多
A supercapacitor electrode has been fabricated from macroscopic porous MnO2 aerogels,and has demonstrated an enhanced specific capacitance,a high rate capability and excellent cycling durability.The improvement of sup...A supercapacitor electrode has been fabricated from macroscopic porous MnO2 aerogels,and has demonstrated an enhanced specific capacitance,a high rate capability and excellent cycling durability.The improvement of supercapacitive performance can be attributed to the macro interconnected channels in the aerogel structure,which can not only facilitate mass transfer and reduce dead volume,but also provide an additional benefit of relieving stress.展开更多
The article presents the synthesis and properties of new organosilica-based ionogels for carbon precursors.A new preparation process using functional ionic liquid 1-propionic acid-2-methyl imidazole bromide as the lin...The article presents the synthesis and properties of new organosilica-based ionogels for carbon precursors.A new preparation process using functional ionic liquid 1-propionic acid-2-methyl imidazole bromide as the linker and an organically modified silica framework as the host yields stable,yellowish and transparent organosilica ionogels.The ionogel is formed by(1)the sol-gel process of an organosilane[3-(2-aminoethylamino)propyl]trimethoxysilane and(2)the covalent interaction of a carboxyl-functional group of the ionic liquid with the amino-containing organosilica.Furthermore,controllable synthesis of nitrogen-doped microporous carbons from the direct pyrolysis of organosilica-based ionogels is reported.The ionic liquid serves as carbon and nitrogen sources,while the organically modified silica framework acts as an inherent template to induce porosity.As a result,high surface areas of up to 1107 m^(2)g^(-1)and high nitrogen contents of up to 3.9 wt%are achieved.The electrode prepared from C-1000 delivers a remarkable capacity of 254 F g^(-1)at a current density of 1 A g^(-1),which can be attributed to the synergistic coupling effect of N-doping,hierarchical porosity and intrinsic defects.展开更多
A facile and sustainable approach is provided to fabricate hierarchically porous carbon(HPC)materials.Firstly,mesoporous carbon–silica composite materials were prepared via a compressed CO_(2)-induced aqueous surfact...A facile and sustainable approach is provided to fabricate hierarchically porous carbon(HPC)materials.Firstly,mesoporous carbon–silica composite materials were prepared via a compressed CO_(2)-induced aqueous surfactant solution self-assembly approach without any additional or complicated operation procedures.After removal of the template,carbonization in N2 and etching of the silica component,HPC was obtained.In particular,the as-made HPC with different pore size distributions and textures can be achieved by simply adjusting the CO_(2)pressure.Meanwhile,from the results of SEM and TEM,the morphology of the samples transforms from plate-shaped to spherical nanoparticles with an increase of the CO_(2)pressure.The promising performance of the developed HPC materials has been demonstrated in their application as a supercapacitor electrode and dye adsorbent.This general strategy can provide a novel route to develop architectural design of hierarchically porous materials in green and alternative chemical processes.展开更多
In this work,three-dimensional porous Ni-Co layered double hydroxide nanosheets are vertically decorated on N-doped reduced graphene oxide via a simple one-step microwave-assisted hydrothermal process.The incorporated...In this work,three-dimensional porous Ni-Co layered double hydroxide nanosheets are vertically decorated on N-doped reduced graphene oxide via a simple one-step microwave-assisted hydrothermal process.The incorporated N-doped reduced graphene oxide brings the following advantages:firstly,the improved hydrophilicity of the N-doped reduced graphene oxide offers more nucleation sites to grow layered double hydroxide nanosheets on its surface.Secondly,the addition of N-doped reduced graphene oxide can greatly enhance the conductivity and specific surface area of the composites,thus resulting in better capacitance performance and improved rate capability.This composite possesses a high specific capacitance of 1720 F g^(-1) at a current density of 3 A g^(-1) and retains 960 F g^(-1) at a high current density of 50 A g^(-1).The asymmetric supercapacitor assembled by adopting the prepared composites as the positive electrode and activated carbon as the negative electrode achieves a high energy density of 31.2 W h kg^(-1) at the power density of 0.354 kW kg^(-1) and a good long-time cycling stability(83%retention over 10000 cycles).展开更多
Molybdenum disulfide(MoS_(2))has drawn considerable attention in energy storage due to its layered structures,large specific surface area,and abundant edges.However,poor conductivity and inert basal planes limit the c...Molybdenum disulfide(MoS_(2))has drawn considerable attention in energy storage due to its layered structures,large specific surface area,and abundant edges.However,poor conductivity and inert basal planes limit the charge transfer and active sites of 2H-MoS_(2),and the metastable phase compromises the long-term stability of 1T-MoS_(2).Herein,MoS_((1-2x))Te_(2x)/carbonized cellulose nanofiber(CCNF)aerogels are prepared through in-situ tellurization-carbonization,where CCNF acts as an excellent dispersant to suppress the restacking of MoS_((1-2x))Te_(2x)nanosheets,thereby providing a porous conductive network that facilitates ion transport.Meanwhile,Te doping introduces defects into the basal plane,thereby improving the electrochemical activity.As-prepared MoS_((1-2x))Te_(2x)/CCNF aerogels exhibit outstanding supercapacitor performance with a massive specific capacitance of 1396 F g^(-1)at 1 Ag^(-1)and an exceptional cyclic retention rate of 91.76%after 5000 cycles.Besides,an asymmetric supercapacitor integrated with a MoS_((1-2x))Te_(2x)/CCNF positive electrode and a MoO_(3)/CCNF negative electrode exhibits a wide working window of 1.2 V,a massive energy density of 38.52 Wh kg^(-1),and a high power density of 592.6 W kg^(-1).This work not only addresses the core challenges associated with 2D transition metal chalcogenides but also leverages a renewable carbon source,paving the way for developing scalable,high-performance,and environmentally friendly supercapacitors.展开更多
Porous carbon aerogel material has gained an increasing attraction for developing supercapacitor electrodes due to its cost-effective synthesis process and relatively high electrochemical performance.However,the envir...Porous carbon aerogel material has gained an increasing attraction for developing supercapacitor electrodes due to its cost-effective synthesis process and relatively high electrochemical performance.However,the environmental performances of supercapacitor electrodes produced from different carbon aerogel materials are never comparatively studied,hindering our knowledge of supercapacitor electrode production in a sustainable pattern.In this study,nitrogen-doped biochar aerogel-based electrode(BA-electrode)produced from Entermorpha prolifera was simulated to investigate the environmental performance by using life cycle assessment method.For comparison,the assessment of graphene oxide aerogel-based electrode(GOA-electrode)was also carried out.It can be observed that the life cycle global warming potential for the BA-electrode was lower than that of GOA-electrode with a reduction of 53.1‒68.1%.In comparison with GOA-electrode,the BA-electrodes endowed smaller impacts on environment in majority of impact categories.Moreover,in comparison with GOA-electrode,the environmental damages of BA-electrode were greatly decreased by 35.8‒56.4%(human health),44.9‒62.6%(ecosystems),and 87.0‒91.2%(resources),respectively.The production stages of GOA and graphene oxide and stages of nitrogen-doped biochar aerogel production and Entermorpha prolifera drying were identified as the hotspots of environmental impact/dam-age for the GOA-electrode and BA-electrode,respectively.Overall,this finding highlights the efficient utilization of algae feedstock to construct a green and sustainable technical route of supercapacitor electrode production.展开更多
MgCo_(2)O_(4),a cobalt-based binary oxide,has garnered increasing attention as a promising active material for supercapacitor electrodes due to its enhanced conductivity and high theoretical capacitance.In this study,...MgCo_(2)O_(4),a cobalt-based binary oxide,has garnered increasing attention as a promising active material for supercapacitor electrodes due to its enhanced conductivity and high theoretical capacitance.In this study,a novel mechanochemical approach was developed to convert stoichiometric MgO and Co_(2)O_(3) into MgCo_(2)O_(4).This innovative synthesis involved a one-step ball milling process that integrates two reaction steps.展开更多
Dwindling energy sources and a worsening environment are huge global problems,and biomass wastes are an under-exploited source of material for both energy and material generation.Herein,self-template decoction dregs o...Dwindling energy sources and a worsening environment are huge global problems,and biomass wastes are an under-exploited source of material for both energy and material generation.Herein,self-template decoction dregs of Ganoderma lucidum-derived porous carbon nanotubes(ST-DDLGCs)were synthesized via a facile and scalable strategy in response to these challenges.ST-DDLGCs exhibited a large surface area(1731.51 m^(2)g^(-1))and high pore volume(0.76 cm^(3)g^(-1)),due to the interlacing tubular structures of precursors and extra-hierarchical porous structures on tube walls.In the ST-DDLGC/PMS system,the degradation efficiency of capecitabine(CAP)reached~97.3%within 120 min.Moreover,ST-DDLGCs displayed high catalytic activity over a wide pH range of 3–9,and strong anti-interference to these typical and ubiquitous anions in wastewater and natural water bodies(i.e.,H_(2)PO_(4)^(-),NO_(3)^(-),Cl^(-) and HCO_(3)^(-)),in which a ^(1)O_(2)-dominated oxidation was identified and non-radical mechanisms were deduced.Additionally,ST-DDLGC-based coin-type symmetrical supercapacitors exhibited outstanding electrochemical performance,with specific capacitances of up to 328.1 F g^(-1)at 0.5 A g^(-1),and cycling stability of up to 98.6%after 10,000 cycles at a current density of 2 A g^(-1).The superior properties of ST-DDLGCs could be attributed to the unique porous tubular structure,which facilitated mass transfer and presented numerous active sites.The results highlight ST-DDLGCs as a potential candidate for constructing inexpensive and advanced environmentally functional materials and energy storage devices.展开更多
Portable electrical power sources play increasingly vital roles in our daily lives due to the widespread use of mobile electronic devices and electrical vehicles.Electrochemical capacitors,also referred as supercapaci...Portable electrical power sources play increasingly vital roles in our daily lives due to the widespread use of mobile electronic devices and electrical vehicles.Electrochemical capacitors,also referred as supercapacitors(SCs)or ultracapacitors,are an important type of energy storage system with superior advantages of rapid power delivery and recharging compared to other types of energy storage systems.In practice,SCs have played im-展开更多
The invention of printing technologies has revolutionized the manner in which information is transmitted and reproduced.In the modern era,printing technologies,which are equipped with computerized control and de-sign ...The invention of printing technologies has revolutionized the manner in which information is transmitted and reproduced.In the modern era,printing technologies,which are equipped with computerized control and de-sign methods,have become considerably efficient and effective,facilitating A significant breakthrough in the manufacture of high-performance electrochemical energy storage systems.Through careful design and execu-tion,the components of energy storage devices,particularly electrodes,can be formulated into functional inks,enabling the use of divers materials and devices in high-performance energy storage applications.This review-focuses on three major printing technologies:inkjet printing,screen printing,and 3D printing,introducing the principles of each printing technology,the design and preparation of various electrode inks,and their applica-tions in supercapacitors.Finally,the challenges and scope for the future development of printing technologies forhigh-performance supercapacitors are presented.展开更多
In this paper,an aramid chopped fiber,so-called(ACF)/polyphenylene sulfide(PPS)composite,containing multi-walled carbon nanotubes(MWCNT),and in situ polymerized polypyrrole(PPy)was designed and fabricated,to be applie...In this paper,an aramid chopped fiber,so-called(ACF)/polyphenylene sulfide(PPS)composite,containing multi-walled carbon nanotubes(MWCNT),and in situ polymerized polypyrrole(PPy)was designed and fabricated,to be applied as a paper based electrode.The ACF/PPS/MWCNT-PPy electrode features highly porous paper-like structure with excel-lent electrochemical activity,rendering it a high areal capacitance of~3205 mF cm^(-2) at a current density of 5 mA cm^(-2).After 5000 charge-discharge cycles,the areal capacitance still maintains 93%and 70%at high current densities of 20 and 80 mA cm^(-2),respectively.Moreover,the ACF/PPS/MWCNT-PPy electrode displays over 50%the areal capacitance and maintains it's mechanical stability after annealing at 300℃.The UL-94 test reveals that the highest V-0 flame-retardant performance can be achieved.All these results suggest that the ACF/PPS/MWCNT-PPy composite is a promising material to be used as electrode for supercapacitor with high energy-storage capability and noninflammability.展开更多
文摘This study explores the potential of Michelia champaca wood as a sustainable and locally available precursor for the fabrication of high-performance supercapacitor electrodes.Activated carbons were synthesized through single-step carbonization at 400℃ and 500℃(SSC-400℃ and SSC-500℃) and double-step carbonization at 400℃(DSC-400℃),with all samples activated using H_(3)PO_(4).The effects of carbonization stratergy on the structural,morphological,and electrochemical characteristics of the resulting carbon materials were systematically evaluated,using techniques such as BET,SEM,TEM,XRD,Raman scattering,FTIR,CV,GCD and EIS.Among the samples,SSC-400℃ exhibited the best electrochemical performance,achieving a specific capacitance of 292.2 Fg^(-1),an energy density of 6.4 Wh kg^(-1),and a power density of 198.4 W kg^(-1).This superior performance is attributed to its optimized pore structure,improved sur-face functionality and enhanced conductivity.SSC-500℃showed marginally lower performance,whereas,DSC-400℃ displayed the least favorable results,indicating that double-step carbonization process may negatively affect material quality by disrupting the pore network.This work highlights a strong correlation between synthesis methodology and electrochemical efficiency,directly reinforcing the importance of process optimization in electrode material develop-ment.The findings contribute to the broader goal of developing cost-effective,renewable and environmentally friendly energy storage systems.By valorizing biomass waste,the study supports global movements toward green energy technologies and circular carbon economies,offering a viable pathway for sustainable supercapacitor development and practical applications in energy storage devices.
文摘Graphene oxide has been used widely as a starting precursor for applications that cater to the needs of tunable graphene. However, the hydrophilic characteristic limits their application, especially in a hydrophobic condition. Herein, a novel non-covalent surface modification approach towards graphene oxide was conducted via a UV-induced photo-polymerization technique that involves two major routes; a UV-sensitive initiator embedded via pi-pi interactions on the graphene planar rings, and the polymerization of hydrophobic polymeric chains along the surface. The functionalized graphene oxide successfully achieved the desired hydrophobicity as it displayed the characteristic of being readily dissolved in organic solvent. Upon its addition into a polymeric solution and subjected to an electrospinning process,non-woven random nanofibers embedded with graphene oxide sheets were obtained. The prepared polymeric nanofibers were subjected to two-step thermal treatments that eventually converted the polymeric chains into a carbon-rich conductive structure. A unique morphology was observed upon the addition of the functionalized graphene oxide, whereby the sheets were embedded and intercalated within the carbon nanofibers and formed a continuous structure. This reinforcement effectively enhanced the electrochemical performance of the carbon nanofibers by recording a specific capacitance of up to 140.10 F/g at the current density of 1 A/g, which was approximately three folds more than that of pristine nanofibers.It also retained the capacitance up to 96.2% after 1000 vigorous charge/discharge cycles. This functionalization technique opens up a new pathway in tuning the solubility nature of graphene oxide towards the synthesis of a graphene oxide-reinforced polymeric structure.
基金financially supported by the National Natural Science Foundation of China(Nos.21207099,21273162,21473122)the Science and Technology Commission of Shanghai Municipality,China(No.14DZ2261100)+1 种基金the Fundamental Research Funds for the Central Universitiesthe Large Equipment Test Foundation of Tongji University
文摘A novel zinc tartrate oriented hydrothermal synthesis of microporous carbons was reported. Zinc–organic complex obtained via a simple chelation reaction of zinc ions and tartaric acid is introduced into the networks of resorcinol/formaldehyde polymer under hydrothermal condition. After carbonization process, the resultant microporous carbons achieve high surface area（up to 1255 m^2/g） and large mean pore size（1.99 nm） which guarantee both high specific capacitance（225 F/g at 1.0 A/g） and fast charge/discharge operation（20 A/g） when used as a supercapacitor electrode. Besides, the carbon electrode shows good cycling stability, with 93% capacitance retention at 1.0 A/g after 1000 cycles. The welldesigned and high-performance microporous carbons provide important prospects for supercapacitor applications.
基金supported by the Natural Science Foundation from Harbin University of Science and Technology and Harbin Institute of Technology
文摘As a supercapacitor electrode, the graphene/polyaniline （PANI） composite sponge with a three-dimensional （3D） porous network structure is synthesized by a simple three-step method. The three steps include an in situ polymerization, freeze-drying and reduction by hydrazine vapor. The prepared sponge has a large specific surface area and porous network structure, so it is in favor of spreading the electrolyte ion and increasing the charge transfer efficiency of the system. The process of preparation is simple, easy to operate and low cost. The composite sponge shows better electrochemical performance than the pure individual graphene sponge while PANI cannot keep the shape of a sponge. Such a composite sponge exhibits specific capacitances of 487 F.g-1 at 2 mV/s compared to pristine PANI of 397 F.g-1.
基金financially supported by the National Natural Science Foundation of China(Nos.21273162,21473122,21501135)the Science and Technology of Shanghai Municipality,China(No.14DZ2261100)+1 种基金the Fundamental Research Funds for the Central Universitiesthe Large Equipment Test Foundation of Tongji University
文摘We demonstrate a simple and highly efficient strategy to synthesize MnO2/nitrogen-doped ultramicroporous carbon nanospheres（MnO2/N-UCNs） for supercapacitor application.MnO2/N-UCNs were fabricated via a template-free polymerization of resorcinol/formaldehyde on the surface of phloroglucinol/terephthalaldehyde colloids in the presence of hexamethylenetetramine,followed by carbonization and then a redox reaction between carbons and KMnO4.As-prepared MnO2/N-UCNs exhibits regular ultramicropores,high surface area,nitrogen heteroatom,and high content of MnO2.A typical MnO2/N-UCNs with 57 wt.%MnO2 doping content（denoted as MnO2（57%）/N-UCNs） makes the most use of the synergistic effect between carbons and metal oxides.MnO2（57%）/N-UCNs as a supercapacitor electrode exhibits excellent electrochemical performance such as a high specific capacitance（401 F/g at 1.0 A/g） and excellent charge/discharge stability（86.3%of the initial capacitance after 10,000 cycles at 2.0 A/g） in 1.0 mol/L Na2SO4 electrolyte.The well-designed and high-performance MnO2/N-UCNs highlight the great potential for advanced supercapacitor applications.
基金supported by Priority Academic Program Development of Jiangsu Higher Education Institutions (YX03001)Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM)+3 种基金Synergistic Innovation Center for Organic Electronics and Information Displays, Jiangsu Provincial NSF (BK20160890, BK20141424, BK20150863)Jiangsu Province "Six Talent Peak" (2014-XCL-014)Qing Lan Project of Jiangsu ProvinceScientific Research Foundation of NUPT (NY214183, NY215014, NY215152)
文摘The deposition of active materials directly onto metal wires is a general strategy to prepare wire-shaped electrodes for flexible and wearable energy storage devices. However, it is still a critical challenge to coat active materials onto the aimed metal wires because of their smooth surface and small specific surface area. In this work, high porous nickel yarns（PNYs） was fabricated using commercial nylon yarns as templates through step-wise electroless plating, electroplating and calcination processes. The PNYs are composed of multiplied fibers with hollow tubular structure of 5–10 μm in diameter, allowing the imbibition of carbon nanotubes（CNTs） solution by a facile capillary action process. The prepared CNTs/PNY electrodes showed a typical electrochemical double layer capacitive performance and the constructed allsolid flexible wire-shaped symmetric supercapacitors provided a specific capacitance of 4.67 F/cm3 with good cycling stability at a current density of 0.6 A/cm3.
基金supported by the Program for New Century Excellent Talents of the University in China(grant no.NCET-13-0645)the National Natural Science Foundation of China(NSFC-21201010,U1304504)+2 种基金the Program for Innovative Research Team(in Science and Technology)in University of Henan Province(14IRTSTHN004)the Science&Technology Foundation of Henan Province(122102210253,13A150019)the China Postdoctoral Science Foundation(2012M521115).
文摘Nickel nanowire foams are primarily synthesized by the calcination of dimethylglyoxime nickel microfibers in Ar gas.Moreover,mesoporous nickel hydroxide-nickel nanohybrids are successfully obtained via oxidation of Ni nanowire foams in an alkaline H_(2)O_(2)aqueous solution.Due to the mesoporous structure of nickel hydroxide and the high conductivity of the central Ni metal,electrodes assembled with nickel hydroxide-nickel nanohybrids show a highly accessible surface-interface site and high conductivity,and are successfully applied as high-performance supercapacitor electrodes.
基金supported by initial funding for top level talents of Shenyang University of Technology and Nature Science Fund of Liaoning province(no.20170540671).
文摘In this work,mesoporous NiCo_(2)O_(4) nanoneedle arrays grown on a nickel foam substrate are fabricated by a facile hydrothermal route.The as-synthesized NiCo_(2)O_(4) products as binder-free electrodes for supercapacitors show a superior discharge areal capacity of 0.998 C cm^(-2) at a current density of 2 mA cm^(-2),excellent rate performance(60.25% retention with current density increasing from 2 mA cm^(-2) to 200 mA cm^(-2))and outstanding cycling stability(about 19.3% loss after 12000 cycles at a current density of 20 mA cm^(-2)).An assembled supercapacitor using a NiCo_(2)O_(4) electrode as the positive electrode delivers a volumetric energy density of 0.33 mW h cm^(-3) at a volumetric power density of 12 mW h cm^(-3) and still achieves 63.6% retention with the volumetric power density increasing to 120 mW h cm^(-3).Surprisingly,140.6% capacity retention is attained after 8000 cycles at 10 mA cm^(-2).
基金supported by grants from the National Natural Science Foundation of China(Grant No.U1662119)Key research and development program of Binzhou University(Grant No.2017ZDL03).
文摘In this study,cobalt-doped nickel sulfide nanomaterials are synthesized.The experimental results show that cobalt is successfully doped into the lattice of NiS_(2).Co-doping causes the hollow sphere sulphides to break down and favors the formation of Ni_(x)Co_(1-x)S_(2)nanostructures with high-density active edge sites.The Ni_(0.75)Co_(0.25)S_(2)sample exhibits a high specific capacitance of 2141.9 F g^(-1)at a current density of 2 A g^(-1)due to its fluffy characteristics and edge site-enriched nanostructure.The asymmetric supercapacitor based on Ni_(0.75)Co_(0.25)S_(2)exhibits a high energy density(54.9 Wh kg^(-1))and stable cycling durability with 85.1%capacitance retention after 4000 cycles.
基金supported by the National Natural Science Foundation of China(NSFC,21471067,51402121,and 51375204)Jilin Provincial Science&Technology Department(20140520163JH and 20140101056JC)Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry.
文摘A supercapacitor electrode has been fabricated from macroscopic porous MnO2 aerogels,and has demonstrated an enhanced specific capacitance,a high rate capability and excellent cycling durability.The improvement of supercapacitive performance can be attributed to the macro interconnected channels in the aerogel structure,which can not only facilitate mass transfer and reduce dead volume,but also provide an additional benefit of relieving stress.
基金National Natural Science Foundation of China(Grant No.21571035,51503038 and 51873037)。
文摘The article presents the synthesis and properties of new organosilica-based ionogels for carbon precursors.A new preparation process using functional ionic liquid 1-propionic acid-2-methyl imidazole bromide as the linker and an organically modified silica framework as the host yields stable,yellowish and transparent organosilica ionogels.The ionogel is formed by(1)the sol-gel process of an organosilane[3-(2-aminoethylamino)propyl]trimethoxysilane and(2)the covalent interaction of a carboxyl-functional group of the ionic liquid with the amino-containing organosilica.Furthermore,controllable synthesis of nitrogen-doped microporous carbons from the direct pyrolysis of organosilica-based ionogels is reported.The ionic liquid serves as carbon and nitrogen sources,while the organically modified silica framework acts as an inherent template to induce porosity.As a result,high surface areas of up to 1107 m^(2)g^(-1)and high nitrogen contents of up to 3.9 wt%are achieved.The electrode prepared from C-1000 delivers a remarkable capacity of 254 F g^(-1)at a current density of 1 A g^(-1),which can be attributed to the synergistic coupling effect of N-doping,hierarchical porosity and intrinsic defects.
基金supported by the Beijing Natural Science Foundation(KZ201810028044).
文摘A facile and sustainable approach is provided to fabricate hierarchically porous carbon(HPC)materials.Firstly,mesoporous carbon–silica composite materials were prepared via a compressed CO_(2)-induced aqueous surfactant solution self-assembly approach without any additional or complicated operation procedures.After removal of the template,carbonization in N2 and etching of the silica component,HPC was obtained.In particular,the as-made HPC with different pore size distributions and textures can be achieved by simply adjusting the CO_(2)pressure.Meanwhile,from the results of SEM and TEM,the morphology of the samples transforms from plate-shaped to spherical nanoparticles with an increase of the CO_(2)pressure.The promising performance of the developed HPC materials has been demonstrated in their application as a supercapacitor electrode and dye adsorbent.This general strategy can provide a novel route to develop architectural design of hierarchically porous materials in green and alternative chemical processes.
基金supported by National key research and develop-ment program(Grant No.2016YFB0901600)NSCF(Grant No.21303162 and Grant No.11604295).
文摘In this work,three-dimensional porous Ni-Co layered double hydroxide nanosheets are vertically decorated on N-doped reduced graphene oxide via a simple one-step microwave-assisted hydrothermal process.The incorporated N-doped reduced graphene oxide brings the following advantages:firstly,the improved hydrophilicity of the N-doped reduced graphene oxide offers more nucleation sites to grow layered double hydroxide nanosheets on its surface.Secondly,the addition of N-doped reduced graphene oxide can greatly enhance the conductivity and specific surface area of the composites,thus resulting in better capacitance performance and improved rate capability.This composite possesses a high specific capacitance of 1720 F g^(-1) at a current density of 3 A g^(-1) and retains 960 F g^(-1) at a high current density of 50 A g^(-1).The asymmetric supercapacitor assembled by adopting the prepared composites as the positive electrode and activated carbon as the negative electrode achieves a high energy density of 31.2 W h kg^(-1) at the power density of 0.354 kW kg^(-1) and a good long-time cycling stability(83%retention over 10000 cycles).
基金supported by the Natural Science Foundation of Fujian Province(Grant No.2023J01524)the Joint Project for Talent Innovation Sharing Alliance of Quanzhou(Grant No.2022C001L)。
文摘Molybdenum disulfide(MoS_(2))has drawn considerable attention in energy storage due to its layered structures,large specific surface area,and abundant edges.However,poor conductivity and inert basal planes limit the charge transfer and active sites of 2H-MoS_(2),and the metastable phase compromises the long-term stability of 1T-MoS_(2).Herein,MoS_((1-2x))Te_(2x)/carbonized cellulose nanofiber(CCNF)aerogels are prepared through in-situ tellurization-carbonization,where CCNF acts as an excellent dispersant to suppress the restacking of MoS_((1-2x))Te_(2x)nanosheets,thereby providing a porous conductive network that facilitates ion transport.Meanwhile,Te doping introduces defects into the basal plane,thereby improving the electrochemical activity.As-prepared MoS_((1-2x))Te_(2x)/CCNF aerogels exhibit outstanding supercapacitor performance with a massive specific capacitance of 1396 F g^(-1)at 1 Ag^(-1)and an exceptional cyclic retention rate of 91.76%after 5000 cycles.Besides,an asymmetric supercapacitor integrated with a MoS_((1-2x))Te_(2x)/CCNF positive electrode and a MoO_(3)/CCNF negative electrode exhibits a wide working window of 1.2 V,a massive energy density of 38.52 Wh kg^(-1),and a high power density of 592.6 W kg^(-1).This work not only addresses the core challenges associated with 2D transition metal chalcogenides but also leverages a renewable carbon source,paving the way for developing scalable,high-performance,and environmentally friendly supercapacitors.
基金the National Natural Science Foundation of China(51808303,51672143,21976185 and 21501105)Science and Technology Support Plan for Youth Innovation of Colleges in Shandong Province(DC2000000961)Taishan Scholar Program,Outstanding Youth of Natural Science in Shandong Province(JQ201713).
文摘Porous carbon aerogel material has gained an increasing attraction for developing supercapacitor electrodes due to its cost-effective synthesis process and relatively high electrochemical performance.However,the environmental performances of supercapacitor electrodes produced from different carbon aerogel materials are never comparatively studied,hindering our knowledge of supercapacitor electrode production in a sustainable pattern.In this study,nitrogen-doped biochar aerogel-based electrode(BA-electrode)produced from Entermorpha prolifera was simulated to investigate the environmental performance by using life cycle assessment method.For comparison,the assessment of graphene oxide aerogel-based electrode(GOA-electrode)was also carried out.It can be observed that the life cycle global warming potential for the BA-electrode was lower than that of GOA-electrode with a reduction of 53.1‒68.1%.In comparison with GOA-electrode,the BA-electrodes endowed smaller impacts on environment in majority of impact categories.Moreover,in comparison with GOA-electrode,the environmental damages of BA-electrode were greatly decreased by 35.8‒56.4%(human health),44.9‒62.6%(ecosystems),and 87.0‒91.2%(resources),respectively.The production stages of GOA and graphene oxide and stages of nitrogen-doped biochar aerogel production and Entermorpha prolifera drying were identified as the hotspots of environmental impact/dam-age for the GOA-electrode and BA-electrode,respectively.Overall,this finding highlights the efficient utilization of algae feedstock to construct a green and sustainable technical route of supercapacitor electrode production.
基金supported by the Sino-Japanese Joint Research Platform on the Energy and Environmental Industry(no.2017YFE0127100)the KE JI XING MENG Project(no.20H100000845).
文摘MgCo_(2)O_(4),a cobalt-based binary oxide,has garnered increasing attention as a promising active material for supercapacitor electrodes due to its enhanced conductivity and high theoretical capacitance.In this study,a novel mechanochemical approach was developed to convert stoichiometric MgO and Co_(2)O_(3) into MgCo_(2)O_(4).This innovative synthesis involved a one-step ball milling process that integrates two reaction steps.
基金financial support from the National Natural Science Foundation of China(21908024,22078374 and 52100173)Key Realm Research and Development Program of Guangdong Province(2020B0202080001)+2 种基金Science and Technology Planning Project of Guangdong Province,China(2021B1212040008)Guangdong Laboratory for Lingnan Modern Agriculture Project(NT2021010)Scientific and Technological Planning Project of Guangzhou(202206010145).
文摘Dwindling energy sources and a worsening environment are huge global problems,and biomass wastes are an under-exploited source of material for both energy and material generation.Herein,self-template decoction dregs of Ganoderma lucidum-derived porous carbon nanotubes(ST-DDLGCs)were synthesized via a facile and scalable strategy in response to these challenges.ST-DDLGCs exhibited a large surface area(1731.51 m^(2)g^(-1))and high pore volume(0.76 cm^(3)g^(-1)),due to the interlacing tubular structures of precursors and extra-hierarchical porous structures on tube walls.In the ST-DDLGC/PMS system,the degradation efficiency of capecitabine(CAP)reached~97.3%within 120 min.Moreover,ST-DDLGCs displayed high catalytic activity over a wide pH range of 3–9,and strong anti-interference to these typical and ubiquitous anions in wastewater and natural water bodies(i.e.,H_(2)PO_(4)^(-),NO_(3)^(-),Cl^(-) and HCO_(3)^(-)),in which a ^(1)O_(2)-dominated oxidation was identified and non-radical mechanisms were deduced.Additionally,ST-DDLGC-based coin-type symmetrical supercapacitors exhibited outstanding electrochemical performance,with specific capacitances of up to 328.1 F g^(-1)at 0.5 A g^(-1),and cycling stability of up to 98.6%after 10,000 cycles at a current density of 2 A g^(-1).The superior properties of ST-DDLGCs could be attributed to the unique porous tubular structure,which facilitated mass transfer and presented numerous active sites.The results highlight ST-DDLGCs as a potential candidate for constructing inexpensive and advanced environmentally functional materials and energy storage devices.
文摘Portable electrical power sources play increasingly vital roles in our daily lives due to the widespread use of mobile electronic devices and electrical vehicles.Electrochemical capacitors,also referred as supercapacitors(SCs)or ultracapacitors,are an important type of energy storage system with superior advantages of rapid power delivery and recharging compared to other types of energy storage systems.In practice,SCs have played im-
基金supported by the National Natural Science Foundation of China(U1904215)Natural Science Foundation of Jiangsu Province(BK20200044)and Changjiang scholars program of the Ministry of Ed-ucation(Q2018270).
文摘The invention of printing technologies has revolutionized the manner in which information is transmitted and reproduced.In the modern era,printing technologies,which are equipped with computerized control and de-sign methods,have become considerably efficient and effective,facilitating A significant breakthrough in the manufacture of high-performance electrochemical energy storage systems.Through careful design and execu-tion,the components of energy storage devices,particularly electrodes,can be formulated into functional inks,enabling the use of divers materials and devices in high-performance energy storage applications.This review-focuses on three major printing technologies:inkjet printing,screen printing,and 3D printing,introducing the principles of each printing technology,the design and preparation of various electrode inks,and their applica-tions in supercapacitors.Finally,the challenges and scope for the future development of printing technologies forhigh-performance supercapacitors are presented.
基金The authors thank the financial support from Key Research and Development Plan of Hubei Province(2020BCB068).
文摘In this paper,an aramid chopped fiber,so-called(ACF)/polyphenylene sulfide(PPS)composite,containing multi-walled carbon nanotubes(MWCNT),and in situ polymerized polypyrrole(PPy)was designed and fabricated,to be applied as a paper based electrode.The ACF/PPS/MWCNT-PPy electrode features highly porous paper-like structure with excel-lent electrochemical activity,rendering it a high areal capacitance of~3205 mF cm^(-2) at a current density of 5 mA cm^(-2).After 5000 charge-discharge cycles,the areal capacitance still maintains 93%and 70%at high current densities of 20 and 80 mA cm^(-2),respectively.Moreover,the ACF/PPS/MWCNT-PPy electrode displays over 50%the areal capacitance and maintains it's mechanical stability after annealing at 300℃.The UL-94 test reveals that the highest V-0 flame-retardant performance can be achieved.All these results suggest that the ACF/PPS/MWCNT-PPy composite is a promising material to be used as electrode for supercapacitor with high energy-storage capability and noninflammability.
